Hairy pawn ending

"And btw it isn't enough to get the first move--you have to see the whole idea..."

That's why I put this line in the OP...because of course from a practical point of view there were only a very limited number of things to be tried as Black in such a position. But rather than simply rattling the "solution" off like an automaton (an artificial practice which unfortunately all of this tactical exercise business may well encourage), I said you should see it from the get-go...inefficient time management or not.